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Diagnostic Description

Similar shortened caudal part of shell as forma pyramidata. Lateral ribs non-distinct, and five dorsal ribs less developed than pyramidata, but striation is more distinct. Whole shell is slightly curved ventrally. Middle part of shell has convex profile with cranial part having somewhat diverging lateral sides. [van der Spoel, 1967]

This species has a wide distribution: subtropical.,[4] European waters, the Mediterranean Sea, the Atlantic Ocean (Azores, Cape Verde), the Northwest Atlantic (Gulf of Maine), the Caribbean Sea, the Gulf of Mexico, and off New Zealand.